<?php
namespace app\common\library;
/**
 * 仿写CodeIgniter的FTP类
 * FTP基本操作：
 * 1) 登陆;    connect
 * 2) 当前目录文件列表;  filelist
 * 3) 目录改变;   chgdir
 * 4) 重命名/移动;  rename
 * 5) 创建文件夹;  mkdir
 * 6) 删除;    delete_dir/delete_file
 * 7) 上传;    upload
 * 8) 下载    download
 *
 * @author quanshuidingdang
 */
class Ftp {
    private $hostname = '';
    private $username = '';
    private $password = '';
    private $port   = 21;
    private $passive  = TRUE;
    private $debug  = TRUE;
    private $conn_id  = FALSE;

    /**
     * 构造函数
     *
     * @param array 配置数组 : $config = array('hostname'=>'','username'=>'','password'=>'','port'=>''...);
     */
    public function __construct($config = array()) {
        if(count($config) > 0) {
            $this->_init($config);
        }
    }

    /**
     * FTP连接
     *
     * @access  public
     * @param  array  配置数组
     * @return boolean
     */
    public function connect($config = array()) {
        if(count($config) > 0) {
            $this->_init($config);
        }

        if(FALSE === ($this->conn_id = @ftp_connect($this->hostname,$this->port))) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_connect");
            }
            return FALSE;
        }

        if( ! $this->_login()) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_login");
            }
            return FALSE;
        }

        if($this->passive === TRUE) {
            ftp_pasv($this->conn_id, TRUE);
        }

        return TRUE;
    }

    /**
     * 目录改变
     *
     * @access  public
     * @param  string  目录标识(ftp)
     * @param boolean
     * @return boolean
     */
    public function chgdir($path = '', $supress_debug = FALSE) {
        if($path == '' OR ! $this->_isconn()) {
            return FALSE;
        }

        $result = @ftp_chdir($this->conn_id, $path);

        if($result === FALSE) {
            if($this->debug === TRUE AND $supress_debug == FALSE) {
                $this->_error("ftp_unable_to_chgdir:dir[".$path."]");
            }
            return FALSE;
        }

        return TRUE;
    }

    /**
     * 目录生成
     *
     * @access  public
     * @param  string  目录标识(ftp)
     * @param int   文件权限列表
     * @return boolean
     */
    public function mkdir($path = '', $permissions = NULL) {
        if($path == '' OR ! $this->_isconn()) {
            return FALSE;
        }

        $result = @ftp_mkdir($this->conn_id, $path);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_mkdir:dir[".$path."]");
            }
            return FALSE;
        }

        if( ! is_null($permissions)) {
            $this->chmod($path,(int)$permissions);
        }

        return TRUE;
    }

    /**
     * 上传
     *
     * @access  public
     * @param  string  本地目录标识
     * @param string 远程目录标识(ftp)
     * @param string 上传模式 auto || ascii
     * @param int  上传后的文件权限列表
     * @return boolean
     */
    public function upload($localpath, $remotepath, $mode = 'auto', $permissions = NULL) {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        if( ! file_exists($localpath)) {
            if($this->debug === TRUE) {
                $this->_error("ftp_no_source_file:".$localpath);
            }
            return FALSE;
        }

        if($mode == 'auto') {
            $ext = $this->_getext($localpath);
            $mode = $this->_settype($ext);
        }

        $mode = ($mode == 'ascii') ? FTP_ASCII : FTP_BINARY;

        $result = @ftp_put($this->conn_id, $remotepath, $localpath, $mode);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_upload:localpath[".$localpath."]/remotepath[".$remotepath."]");
            }
            return FALSE;
        }

        if( ! is_null($permissions)) {
            $this->chmod($remotepath,(int)$permissions);
        }

        return TRUE;
    }

    /**
     * 下载
     *
     * @access  public
     * @param  string  远程目录标识(ftp)
     * @param string 本地目录标识
     * @param string 下载模式 auto || ascii
     * @return boolean
     */
    public function download($remotepath, $localpath, $mode = 'auto') {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        if($mode == 'auto') {
            $ext = $this->_getext($remotepath);
            $mode = $this->_settype($ext);
        }

        $mode = ($mode == 'ascii') ? FTP_ASCII : FTP_BINARY;

        $result = @ftp_get($this->conn_id, $localpath, $remotepath, $mode);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_download:localpath[".$localpath."]-remotepath[".$remotepath."]");
            }
            return FALSE;
        }

        return TRUE;
    }

    /**
     * 重命名/移动
     *
     * @access  public
     * @param  string  远程目录标识(ftp)
     * @param string 新目录标识
     * @param boolean 判断是重命名(FALSE)还是移动(TRUE)
     * @return boolean
     */
    public function rename($oldname, $newname, $move = FALSE) {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        $result = @ftp_rename($this->conn_id, $oldname, $newname);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $msg = ($move == FALSE) ? "ftp_unable_to_rename" : "ftp_unable_to_move";
                $this->_error($msg);
            }
            return FALSE;
        }

        return TRUE;
    }

    /**
     * 删除文件
     *
     * @access  public
     * @param  string  文件标识(ftp)
     * @return boolean
     */
    public function delete_file($file) {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        $result = @ftp_delete($this->conn_id, $file);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_delete_file:file[".$file."]");
            }
            return FALSE;
        }

        return TRUE;
    }

    /**
     * 删除文件夹
     *
     * @access  public
     * @param  string  目录标识(ftp)
     * @return boolean
     */
    public function delete_dir($path) {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        //对目录宏的'/'字符添加反斜杠'\'
        $path = preg_replace("/(.+?)\/*$/", "\\1/", $path);

        //获取目录文件列表
        $filelist = $this->filelist($path);

        if($filelist !== FALSE AND count($filelist) > 0) {
            foreach($filelist as $item) {
                //如果我们无法删除,那么就可能是一个文件夹
                //所以我们递归调用delete_dir()
                if( ! @delete_file($item)) {
                    $this->delete_dir($item);
                }
            }
        }

        //删除文件夹(空文件夹)
        $result = @ftp_rmdir($this->conn_id, $path);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_delete_dir:dir[".$path."]");
            }
            return FALSE;
        }

        return TRUE;
    }

    /**
     * 修改文件权限
     *
     * @access  public
     * @param  string  目录标识(ftp)
     * @return boolean
     */
    public function chmod($path, $perm) {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        //只有在PHP5中才定义了修改权限的函数(ftp)
        if( ! function_exists('ftp_chmod')) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_chmod(function)");
            }
            return FALSE;
        }

        $result = @ftp_chmod($this->conn_id, $perm, $path);

        if($result === FALSE) {
            if($this->debug === TRUE) {
                $this->_error("ftp_unable_to_chmod:path[".$path."]-chmod[".$perm."]");
            }
            return FALSE;
        }
        return TRUE;
    }

    /**
     * 获取目录文件列表
     *
     * @access  public
     * @param  string  目录标识(ftp)
     * @return array
     */
    public function filelist($path = '.') {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        return ftp_nlist($this->conn_id, $path);
    }

    /**
     * 关闭FTP
     *
     * @access  public
     * @return boolean
     */
    public function close() {
        if( ! $this->_isconn()) {
            return FALSE;
        }

        return @ftp_close($this->conn_id);
    }

    /**
     * FTP成员变量初始化
     *
     * @access private
     * @param array 配置数组
     * @return void
     */
    private function _init($config = array()) {
        foreach($config as $key => $val) {
            if(isset($this->$key)) {
                $this->$key = $val;
            }
        }
        //特殊字符过滤
        $this->hostname = preg_replace('|.+?://|','',$this->hostname);
    }

    /**
     * FTP登陆
     *
     * @access  private
     * @return boolean
     */
    private function _login() {
        return @ftp_login($this->conn_id, $this->username, $this->password);
    }

    /**
     * 判断con_id
     *
     * @access  private
     * @return boolean
     */
    private function _isconn() {
        if( ! is_resource($this->conn_id)) {
            if($this->debug === TRUE) {
                $this->_error("ftp_no_connection");
            }
            return FALSE;
        }
        return TRUE;
    }

    /**
     * 从文件名中获取后缀扩展
     *
     * @access  private
     * @param  string  目录标识
     * @return string
     */
    private function _getext($filename) {
        if(FALSE === strpos($filename, '.')) {
            return 'txt';
        }

        $extarr = explode('.', $filename);
        return end($extarr);
    }

    /**
     * 从后缀扩展定义FTP传输模式  ascii 或 binary
     *
     * @access  private
     * @param  string  后缀扩展
     * @return string
     */
    private function _settype($ext) {
        $text_type = array (
            'txt',
            'text',
            'php',
            'phps',
            'php4',
            'js',
            'css',
            'htm',
            'html',
            'phtml',
            'shtml',
            'log',
            'xml'
        );

        return (in_array($ext, $text_type)) ? 'ascii' : 'binary';
    }

    /**
     * 错误日志记录
     *
     * @access  prvate
     * @return boolean
     */
    private function _error($msg) {
        return @file_put_contents('ftp_err.log', "date[".date("Y-m-d H:i:s")."]-hostname[".$this->hostname."]-username[".$this->username."]-password[".$this->password."]-msg[".$msg."]\n", FILE_APPEND);
    }
}

